PDF malware analysis — malicious · f50bc27309ff9e4b

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 03:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20

MD5: d904c7d922dbe9e0369da0cb7c9104cb SHA-1: 2523ee3d6bcb8f58af0056c822eda58e70933926 SHA-256: f50bc27309ff9e4b5ad61963ecd4caa6dce37e1d3ad48e3a56f4c45b9b61a8ee

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URIs suggest a phishing or spam campaign aimed at driving traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://cructi.ru/uplcv?utm_term=live+free+cricket+app PDF link annotation
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef57ddce7---lilefobo.pdfIn PDF document text
- http://hamkr.com/userData/board/file/lepewunixolekixigosixenak.pdfIn PDF document text
- https://beeshark.ro/app/webroot/files/userfiles/files/72069805330.pdfIn PDF document text
- https://castilloexterior.es/ckfinder/userfiles/files/11189170716.pdfIn PDF document text
- https://florissantdesign.nl/docs/Image/file/88345749569.pdfIn PDF document text
- http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161334422717f1---30629381803.pdfIn PDF document text
- https://www.akilciilacdernegi.com/ckfinder/userfiles/files/basetopedomozesoviba.pdfIn PDF document text
- https://likeevent.it/writable/public/userfiles/file/rixazawajo.pdfIn PDF document text
- http://cosmikkino.ru/sadm_files/20605798659.pdfIn PDF document text
- http://regalmotors-jp.com/js/upload/files/zofuxafe.pdfIn PDF document text
- http://le-nora.com/userfiles/file/13812358617.pdfIn PDF document text
- http://numismatika-nbkpdy.cz/userfiles/file/febejipesofa.pdfIn PDF document text
- https://bachson.net/upload/file/sajowupujebovaditovajaj.pdfIn PDF document text
- http://likebarcode.com/image/files/20210908_120732.pdfIn PDF document text
- http://pattarasawat.com/ckfinder/userfiles/files/zebuvuduxape.pdfIn PDF document text
- http://livestocktool.com/d/files/18261559008.pdfIn PDF document text
- http://kftchem.com/upload/files/nojoxojofokod.pdfIn PDF document text
- http://grandinhr.eu/images/user/file/fenivurixe.pdfIn PDF document text
- http://boletos.luzservicos.com/ckfinder/userfiles/files/5333340752.pdfIn PDF document text
- http://soleilboo.com/images/uploads/files/palodof.pdfIn PDF document text
- https://abriganature.centralcms.cloud/galeria/files/natejezidironarovoduze.pdfIn PDF document text
- https://photofetimages.com/57383716466.pdfIn PDF document text
- http://gdlianyu.com/uploadfiles/file/26855093382.pdfIn PDF document text
- https://pre-www.bridge-college.com/uploaded/ckeditor/files/56960056878.pdfIn PDF document text
- http://gourmethousemacau.com/UploadFilesfile///jujamikerisesanun.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e534.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE534	10148 bytes
SHA-256: `c926cd135cd9dfe3335b9464e5cfbebd083edd87d997aa891546ea702da00838`
`font_01_sfnt_off0000fc19.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC19	17352 bytes
SHA-256: `5dacc0e1bf5c9eba12cd86b477c1da6cccc05e8763402fe0f5eafcfd3f2bc508`
`font_02_sfnt_off00012890.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12890	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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